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POCore Data doesn't save data until the app is closed
 

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  1. POCore Data doesn't save data until the app is closed
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    <p>I'm trying to save data into core data after the completion of a web request. In <code>AppDelegate</code> I have my context. In the following the code for get the context:</p> <pre><code>- (NSManagedObjectContext *)contex { @synchronized(self) { if (_contex == nil) { _contex = [[NSManagedObjectContext alloc] init]; [_contex setPersistentStoreCoordinator:self.persistentStoreCoordinator]; } return _contex; } } </code></pre> <p>Like the Apple guidelines say, I have one persistent store coordinata shared with multiple contexts.</p> <p>This is the code where I take the data from web, get the context and make the call to the method for save the new value into core data.</p> <pre><code>NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:request completionHandler:^(NSURL *localFile, NSURLResponse *response, NSError *error) { [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; UIImage *image; if (!error) { NSData *imageData = [NSData dataWithContentsOfURL:localFile]; image = [UIImage imageWithData:imageData]; dispatch_async(dispatch_get_main_queue(), ^{ [[NSNotificationCenter defaultCenter] postNotificationName:@"thumbnailIsSetted" object:self userInfo:@{@"image": image, @"PhotoUrl": photo.url}]; @synchronized(self) { NSManagedObjectContext *context = [(SocialMapAppDelegate *)[[UIApplication sharedApplication] delegate] contex]; [Photo addThumbnailData:imageData toPicture:photo.url fromContext:context]; } }); } else { //if we get an error, we send the default icon image = [UIImage imageNamed:@"Photo-thumbnail"]; dispatch_async(dispatch_get_main_queue(), ^{ [[NSNotificationCenter defaultCenter] postNotificationName:@"thumbnailIsSetted" object:self userInfo:@{@"cached image": image, @"PhotoUrl": photo.url}]; }); } }]; [task resume]; //we resume the task in case it is souspended }]; </code></pre> <p>and this is the method that I use for save the data into core data:</p> <pre><code>+ (void)addThumbnailData:(NSData *)data toPicture:(NSString *)pictureUrl fromContext:(NSManagedObjectContext *)context { if (pictureUrl &amp;&amp; context) { NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Photo"]; request.predicate = [NSPredicate predicateWithFormat:@"url == %@",pictureUrl]; NSError *error = nil; NSArray *matches = [context executeFetchRequest:request error:&amp;error]; if ([matches count] == 1) { Photo *photo = [matches lastObject]; photo.thumbnailData = data; if (![context save:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); } } } } </code></pre> <p>I can't figure where is the problem, the context is not nil, and I don't get any error. If i restart the app the data are there.</p>
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    2. COWhere do you expect to refresh data within the UI?
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